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infestation

[in-fe-stey-shuh n]
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noun
  1. the act of infesting; state of being infested.
  2. a harassing or troublesome invasion: an infestation of ants.

Origin of infestation

1375–1425; late Middle English infestacio(u)n < Late Latin infestātiōn- (stem of infestātiō). See infest, -ation
Related formsre·in·fes·ta·tion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for infestation

n.

early 15c., from Late Latin infestationem (nominative infestatio) "a troubling, disturbing, molesting," noun of action from past participle stem of infestare (see infest).

Online Etymology Dictionary, © 2010 Douglas Harper